Hysteresis Bearingless Slice Motors with Homopolar Flux-biasing.
Hysteresis Bearingless Slice Motors with Homopolar Flux-biasing.
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DOI：
10.1109/tmech.2017.2740429
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发表时间：
2017-10
期刊：
影响因子：
--
通讯作者：
Trumper DL
中科院分区：
文献类型：
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作者：
Noh M;Gruber W;Trumper DL
提出了一种新的无轴承薄片电机的概念，它使一个环形实心转子悬浮并旋转。转子由表现出磁滞的半硬磁材料制成，例如D2钢。转子径向偏置有同极永磁磁通，定子可在其上偏转2极磁通以产生悬浮力。通过基于位置反馈调节悬挂力，主动稳定两个径向转子自由度。由于偏置通量的磁阻力，两个倾斜自由度和轴向平移是被动稳定的。此外，定子可以通过叠加6极旋转磁通产生转矩，该转矩通过磁滞耦合拖动转子。该6极磁通不与单极磁通或2极磁通一起产生径向力，因此悬挂力的产生原则上与驱动扭矩的产生解耦。我们已经开发了一个原型系统作为概念验证。定子有12个齿，每个齿都有一个单相绕组，由线性双稳态功率放大器单独驱动。该系统具有四个反射式光学传感器，用于差分测量转子的两个径向自由度。悬架控制回路被实现为使得相位裕度在110 Hz的交叉频率处为25度。原型系统可以悬浮转子，并将其驱动到约1730 rpm。最大驱动扭矩约为2.7 mNm。
We present a new concept of bearingless slice motor that levitates and rotates a ring-shaped solid rotor. The rotor is made of a semi-hard magnetic material exhibiting magnetic hysteresis, such as D2 steel. The rotor is radially biased with a homopolar permanent-magnetic flux, on which the stator can superimpose 2-pole flux to generate suspension forces. By regulating the suspension forces based on position feedback, the two radial rotor degrees of freedom are actively stabilized. The two tilting degrees of freedom and the axial translation are passively stable due to the reluctance forces from the bias flux. In addition, the stator can generate a torque by superimposing 6- pole rotating flux, which drags the rotor via hysteresis coupling. This 6-pole flux does not generate radial forces in conjunction with the homopolar flux or 2-pole flux, and therefore the suspension force generation is in principle decoupled from the driving torque generation. We have developed a prototype system as a proof of concept. The stator has twelve teeth, each of which has a single phase winding that is individually driven by a linear transconductance power amplifier. The system has four reflective-type optical sensors to differentially measure the two radial degrees of freedom of the rotor. The suspension control loop is implemented such that the phase margin is 25 degrees at the cross-over frequency of 110 Hz. The prototype system can levitate the rotor and drive it up to about 1730 rpm. The maximum driving torque is about 2.7 mNm.